The effect of a non-minimally coupled scalar field upon classical thermodynamics

Details The effect of a non-minimally coupled scalar field upon classical thermodynamics The effect of a non-minimally coupled scalar field upon classical thermodynamics

Nov 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982nuphb.208..182p&link_type=abstract

Nuclear Physics B, Volume 208, Issue 1, p. 182-188.

Physics

Nuclear Physics

Scientific paper

It is known that a scalar field that is non-minimally coupled to the geometry implies a varying gravitational ``constant'' Geff, and hence a violation of the continuity equations, T˚ikk ≠ 0, where T˚ij is the uncorrected energy-momentum tensor. This in turn upsets classical thermodynamics. 3he simplest resolution of this difficulty is to multiply all energetic quantities by Geff/GN, where GN is the newtonian gravitational constant. This modified thermodynamics is applied to the scalar-field version of the cosmological model of Zee, for which it is shown to cause restoration of the symmetry above some critical temperature Tc close to the Planck temperature. We also illustrate how the second law of thermodynamics is always obeyed, correcting a recent discussion by Davies.

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